Abstract:To improve the simplicity of dynamic characteristic parameters of mechanical joints in numerical analyzing a mechanical structure, a new method based on the equivalent parameters is proposed. The universal normal and tangential dynamic stiffness of joints in the unit area are obtained by experiments, and the joint in the unit area is equivalent to the isotropic continuous medium. Based on the GW contact model, the relationship between the microstructure and the dynamic stiffness of the

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... joint in the unit area is established. According to the stress wave propagation condition of discrete elements, the relationship between the normal and tangential dynamic stiffness in the unit area is studied. Equivalent characteristic parameters of joints, including the elastic modulus and Poisson's ratio in the unit area, are deduced. Two bolted steel plates are taken as an example to be analyzed theoretically and experimentally. The comparison between results of calculation and results of experiment verifies the feasibility and accuracy of the proposed method. The result presented in this work can be considered as a stepping stone to be used toward the further research of joints' problem. Key words:joint;numerical analysis;equivalent parameter;GW contact model